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System and method for venting pressure from an integrated circuit package sealed with a lid
   
Document Number
US Patent 7534716
Issued Date
May 19, 2009
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Abstract
A system and method is disclosed for venting pressure from an integrated circuit package that is sealed with a lid. During a surface mount process for mounting a ball grid array integrated circuit package to a circuit board the application of heat (1) weakens the solder that seals a soldered lid, and (2) increases vapor pressure within the integrated circuit package. This may cause the soldered lid to move out of its soldered position. The present invention solves this problem by providing an integrated circuit with a solder mask that has a plurality of solder mask vents that form a plurality of vapor pressure vents through the solder. The vapor pressure vents prevent the occurrence of any increase in vapor pressure that would shift the soldered lid out of its soldered position. An alternate embodiment vents pressure through an epoxy layer that is used to attach a lid by epoxy.
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Number of Claims:
20
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Owner
STMicroelectronics, Inc. (Carrollton, TX)
Published
May 19, 2009
Application Number
11/517,879
Filed
September 8, 2006
US Classification
438/614   438/124
Int'l Classification
H01L   21/44   (20060101)  
Examiner
Assistant Examiner
Parent Case
This application is a divisional of prior U.S. patent application Ser. No. 10/405,529 filed on Apr. 2, 2003 now U.S. Pat. No. 7,126,210.
USPTO Field of Search
438/108   438/118   438/123   438/124   438/125   438/126   438/127   438/612   438/614   438/617   438/666   257/E23.015   257/E23.02   257/E23.023   257/E31.117   257/E31.118   257/E51.02  
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